It will always include a subject and a verb.
C.flock canada is a pronoun, so not b. loudly is some type of verb so not d. and barn isn't collective.
He's personifying the wind and rain by giving it human characteristics for dramatic effect.
Answer:
It's because books give us many education which helps us and also a friend is said a friend when he/her helps us so books are also our friends.
In my view